Northern Saskatchewan PROJECT CLEANS Patty Ogilvie-Evans, B.Sc., P.Geo

Assessment of Risks with Underground Workings at Abandoned Legacy Mines- Northern Saskatchewan PROJECT CLEANS Patty Ogilvie-Evans, B.Sc., P.Geo. David Sanscartier, PhD, P.Eng.

 SRC manages the project on behalf of the province (Ministry of Economy)  Project CLEANS initiated the program in 2006  GOAL of Project CLEANS is to transfer 37 sites to ICP  37 abandoned cold-war era uranium mine sites • Two mill sites with unconsolidated tailing - Gunnar Mine (mine and mill) 1955 – 1963 - Lorado Mill (mill only) 1957 – 1960 • 35 Satellite mine sites (without tailings) are located near Uranium City (two sites near LaRonge)

 Legacy cold-war uranium mines and uranium exploration sites  Ore from these legacy mines was processed at Lorado and/or Eldorado mills  Abandoned with little to no clean-up  Gunnar Tailings and Gunnar Other Aspects ongoing  Since 2006, SRC has initiated remediation at 19 of 35 satellite sites • Remediation complete at eight sites • Remediation on-going at nine sites • Desktop Risk Assessments of underground workings on two sites • Assessment initiated at remaining 14 sites

After

Sk. Provincial Archives Before

Cayzor Athabasca Mines Ltd.

Thin Crown Pillars

COLLECT REVIEW MATCH SMAD Surface Plans Surface - Maps, reports, U/G plans discoveries to clippings historical MINE PLANS documents

2D/3D- Desktop Risk Assessments ArcGIS GEOREFERENCE Use to Aide & Field Documents and surface plans visualization for Investigations OPENINGS/ CROWN PILLARS

Historical Data GIS & MECON QA/QC Geodatabase Web GIS MOE Lab Data 3D Models Consultants Field Data Reporting Stakeholders

Import Processing Transfer Storage Analysis Publishing Access

Trick to understanding these sites TODAY is to look into the PAST. CHALLENGES:  Limited or non-existence records  Mines range from late 1940-50’s to 1970’s  Incomplete documents  Un-validated records or source So starts the beginning of the puzzle...

It’s a PUZZLE where you have:  Only a FEW pieces of the puzzle  Pieces that have been mixed up with others  Some of the pieces have been lost forever

www.presentermedia.com

You look at ANYTHING that can help you find the missing pieces!  SMAD files (Saskatchewan Mineral Assessment Database)  SMDI index (Saskatchewan Mineral Database Index)  Newspaper articles/archival photos  Provincial archives  Aerial photos (historical)  Historical documents and mine plans www.presentermedia.com

Find more pieces to the puzzle…  This is where we start making the story for the legacy site  Was there exploration? How many raises to surface?  Helps us build our remediation plan

ANSWER AS MANY QUESTIONS AS POSSIBLE

 Abandoned mine located approximately 2.5 km southwest of Uranium City  Two main uranium mining operations were in production on this site 1) Lake Cinch Mines Ltd. 1954 - 1960 2) Cenex Mines Ltd. 1978 - 1979  Two different locations on the site

So what was the story ?? www.presentermedia.com

Georeferenced historical documents to 2D allows: Analysis of underground trace to surface View where historical buildings were located View historical site infrastructure View historical site roads/trails Plan sampling areas (soil contamination, Gamma, etc.) View underground projections while walking on surface to walk for disturbances/subsidence

16 Copyright © SRC 2016 Confidential and Copyright © SRC 2014 Field Investigations The picture now becomes clearer…  Field investigation lets you use the information you have gathered to assist in confirming what actually is there  Georeferenced 2D overlays developed guide field surveys  Aids finding things (open raises, adits, trenches otherwise

potentially missed during a www.presentermedia.com routine site visit walk).

With all the puzzle pieces removed (or most of them), discoveries can be made!

Adit at Nicholson Mines Raise at N.L Eagle Mine

 Using data to provide Consultants with information to conduct underground risk assessments

Golder and Associates Ltd.

Due to remote locations, we MUST look at the balancing of costly field investigations with • Benefits • Risks • Costs Overall project GOALS

To help with the visualization and search for openings, crown pillar issues and other structural integrities to consider on sites

Use information to build 3D models

Gunnar Mine 3D

Clear picture of site aspects Assist in locating potential hazards Openings to surface Thin crown pillars Augment field investigations Strong tool for stakeholder www.presentermedia.com engagements